The three-pass multi-bypass dual-channel SY-type design makes the materials carbonized and dried. The materials contact with the hot air source three times from the multiple bypass to improve the heat utilization efficiency from the source. The double channel SY design uses carbonization final hot exhaust gas collection channels, carbonization of pyrolysis heat collection, pre-drying steam collection, etc. Measured by the technical department, the heat utilization of the device reaches 70% or more!